Mostly agree Andybloke, but not quite. The autoroutes are fine if (a) at times we really need to cover some distance thus allowing time to tackle some special tracks in the course of the day, or (b) mechanical problems mean a short cut is the only way to make up time. But under normal circumstances, teams are going to miss out on some awesome routes at times, even on the Nationals or B-roads. Put it this way, there's a damn reason I take off on a 2,500 mile reconnoitre to compile the Road Book!
That said, if a team's priority is a shopping expedition or making it to the bar first, who are we to say what's right or wrong; their choice after all.
Then there's teams like Monstar or Remember Chernobyl who made it their mission to drive every last track they could possibly find - whether it was in the Road Book or not.
End of the day, each to their own!